{"id":21,"date":"2023-07-30T15:08:00","date_gmt":"2023-07-30T15:08:00","guid":{"rendered":"https:\/\/my.albertsnow.xyz\/?p=21"},"modified":"2023-07-30T15:08:00","modified_gmt":"2023-07-30T15:08:00","slug":"activity-fragment-viewpager-activity%e8%a2%ab%e9%94%80%e6%af%81","status":"publish","type":"post","link":"https:\/\/my.albertsnow.xyz\/?p=21","title":{"rendered":"Activity + Fragment + ViewPager Activity\u88ab\u9500\u6bc1"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">\u95ee\u9898\uff1a<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Activity\u91cd\u5efa\u540e\uff0c\u4e3a\u4ec0\u4e48 ViewPager\u91cc\u7684Fragment\u591a\u4e86\u4e00\u500d\n<ul class=\"wp-block-list\">\n<li>\u6211\u7684case\uff1a\u81ea\u5df1\u5728ViewPager\u7684adapter\u91cc new\u7684Fragment\uff0c\u7cfb\u7edf\u53c8 restore \u4e00\u4e2a Fragment\u3002<\/li>\n\n\n\n<li>\u7136\u540e\u4e1a\u52a1\u903b\u8f91\u7528 new\u7684Fragment\uff0c\u7cfb\u7edf\u5374\u7528restore\u7684Fragment\uff0c\u5bfc\u81f4new\u7684Fragment\u58f0\u660e\u5468\u671f\u90fd\u6ca1\u8d70\uff0c\u4e4b\u540e\u5c31\u4f1a\u5404\u79cd\u5f02\u5e38\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u7ed3\u8bba\u5148\u884c<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u521b\u5efaFragment\u65f6\uff0c\u8981\u8003\u8651\u5230Fragment\u88ab\u6062\u590d\u7684case\uff0c\u8fd9\u65f6\u4e0d\u8be5 new\uff0c\u800c\u662f \u6062\u590d\u72b6\u6001<\/li>\n\n\n\n<li>Activity\u88ab \u9500\u6bc1 \u91cd\u5efa\u540e\uff0c\u5982\u679c\u7528ViewPager\u7528\u7684 FragmentStatePagerAdapter\uff0c\u7cfb\u7edf\u4f1a\u91cd\u65b0\u521b\u5efa Fragment \u5b9e\u4f8b\n<ul class=\"wp-block-list\">\n<li>Activity\u88ab\u9500\u6bc1\u65f6\uff0cFragmentManagetImpl \u8c03\u7528saveAllState\uff0c\u5c06\u4fdd\u5b58Fragment\u7684\u72b6\u6001 FragmentManagerState\uff08Parcelable\u5b50\u7c7b IPC\u8de8\u8fdb\u7a0b\u4f7f\u7528\uff09\u3002<\/li>\n\n\n\n<li>Activity\u91cd\u5efa\u65f6\uff0c\u4f1a\u6839\u636e FragmentManagerState \uff0c\u91cd\u65b0\u521b\u5efaFragment<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u7f16\u5199Activity\u65f6\uff0c\u4e00\u5b9a\u8981\u8003\u8651\u4ed6\u4f1a\u88abdestroy\u7684\u60c5\u666f\uff08\u6bd4\u5982\u5185\u5b58\u7d27\u5f20, \u8fd9\u4e0d\u53d7\u4f60\u63a7\u5236\uff09\n<ul class=\"wp-block-list\">\n<li>\u4e00\u4e2a\u5185\u5b58\u6cc4\u6f0f\u5c31\u53ef\u4ee5\u5f15\u53d1\uff0c\u5f53\u7136\u6cc4\u6f0f\u591a\u4e86\u5c31OOM\uff0c\u770b\u8d77\u6765\u6307\u6807\u4e0d\u6cbb\u672c<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u600e\u6837\u6a21\u62dfActivity\u88ab\u9500\u6bc1\uff1f\u53ef\u4ee5\u53bb\u5f00\u53d1\u8005\u8bbe\u7f6e\u91cc\uff0c\u52fe\u9009 \u4e0d\u4fdd\u5b58\u6d3b\u52a8 \uff08\u6211\u6ca1\u8bd5\u8fc7\uff0c\u4e4b\u540e\u8bd5\u8fc7\u518d\u786e\u8ba4\uff09<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>Parcelable saveAllState() {\n                    FragmentManagerState fms = new FragmentManagerState();\n                fms.mActive = active;\n                fms.mAdded = added;\n                fms.mBackStack = backStack;<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u600e\u4e48\u521b\u5efaFragment<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u521b\u5efa\u524d\u5148\u5224\u65adFragmentManager\u4e2d\u662f\u5426\u5df2\u8be5Activity<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>        adapter = new FragmentStatePagerAdapter(getChildFragmentManager());\n        if (getFragmentManager().getFragments() != null) {\n            adapter.initData(getFragmentManager().getFragments());\n        } else {\n            adapter.initData();\n        }<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u5982\u679c\u4e0d\u7528ViewPager\u3002Fragment\u7684\u521b\u5efa\u3001\u6062\u590d<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>private MainFragment mainFragment;\nprivate SecondaryFragment secondaryFragment;\n\n@Override\npublic void onCreate(@Nullable Bundle savedInstanceState) {\n    super.onCreate(savedInstanceState);\n    if (savedInstanceState != null) {\n        mainFragment = (MainFragment) fm.getFragment(savedInstanceState, MainFragment.TAG);\n        secondaryFragment = (SecondaryFragment) fm.getFragment(savedInstanceState, SecondaryFragment.TAG);\n    }\n    if (mainFragment == null) {\n        mainFragment = new MainFragment();\n    }\n    if(secondaryFragment == null){\n        secondaryFragment = new SecondaryFragment()\n    }\n    \/\/ ViewPager \u7684\u76f8\u5173\u64cd\u4f5c\n}\n\n@Override\nprotected void onSaveInstanceState(Bundle outState) {\n    super.onSaveInstanceState(outState);\n    if (mainFragment.isAdded()) {\n        fm.putFragment(outState, MainFragment.TAG, mainFragment);\n    }\n    if (secondaryFragment.isAdded()) {\n        fm.putFragment(outState, SecondaryFragment.TAG, secondaryFragment);\n    }\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">FragmentPagerAdapter \u4e0e FragmentStatePagerAdapter<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u770b\u8fd9\u4e2a<a href=\"https:\/\/blog.csdn.net\/goodlixueyong\/article\/details\/50257079\">\u6587\u7ae0<\/a><\/li>\n\n\n\n<li>FragmentPagerAdapter \u662f\u5c06Fragment\u4fdd\u5b58\u5230 FragmentManager\u91cc\uff0c\u8fdb\u884c\u590d\u7528\n<ul class=\"wp-block-list\">\n<li>\u9002\u5408\u9759\u6001\u7684\u3001\u5c11\u754c\u9762\u7684ViewPager\uff0c\u52a0\u8f7dFragment\u8fc7\u591a\uff0c\u4f1a\u589e\u52a0\u5185\u5b58\u6d88\u8017<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>FragmentStatePagerAdapter \u662f\u901a\u8fc7\u5bf9 FragmentManagerState \u6765\u5b9e\u73b0\u72b6\u6001\u7684\u590d\u7528\uff08Fragment\u4f1a\u88ab\u65b0\u521b\u5efa\uff0c\u4f46\u72b6\u6001\u4e00\u81f4\uff09\n<ul class=\"wp-block-list\">\n<li>\u9ed8\u8ba4\u4e0d\u4fdd\u5b58\u6240\u6709\u7684Fragment\uff0c\u800c\u662f \u524d\u9875\u97621\u4e2a+\u5f53\u524d+\u540e\u9875\u97621\u4e2a= 3\u4e2a\u9875\u9762\u88ab\u7f13\u5b58<\/li>\n\n\n\n<li>\u524d\u9762\u3001\u540e\u9762\u9875\u9762\u7f13\u5b58\u4e2a\u6570\u901a\u8fc7 ViewPager setOffscreenPageLimit (int limit\uff09\u8bbe\u7f6e<\/li>\n\n\n\n<li>\u53ef\u4ee5\u5728Activity\u9500\u6bc1\u91cd\u5efa\u540e\uff0c\u56de\u590dUI\u72b6\u6001<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u95ee\u9898\uff1a \u7ed3\u8bba\u5148\u884c \u600e\u4e48\u521b\u5efaFragment \u5728\u521b\u5efa\u524d\u5148\u5224\u65adFragmentManager\u4e2d\u662f\u5426\u5df2\u8be5Activi &hellip; <a href=\"https:\/\/my.albertsnow.xyz\/?p=21\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">Activity + Fragment + ViewPager Activity\u88ab\u9500\u6bc1<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[4,5],"class_list":["post-21","post","type-post","status-publish","format-standard","hentry","category-android","tag-fragment-restore","tag-viewpager-fragment"],"_links":{"self":[{"href":"https:\/\/my.albertsnow.xyz\/index.php?rest_route=\/wp\/v2\/posts\/21","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/my.albertsnow.xyz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/my.albertsnow.xyz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/my.albertsnow.xyz\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/my.albertsnow.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=21"}],"version-history":[{"count":1,"href":"https:\/\/my.albertsnow.xyz\/index.php?rest_route=\/wp\/v2\/posts\/21\/revisions"}],"predecessor-version":[{"id":22,"href":"https:\/\/my.albertsnow.xyz\/index.php?rest_route=\/wp\/v2\/posts\/21\/revisions\/22"}],"wp:attachment":[{"href":"https:\/\/my.albertsnow.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=21"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/my.albertsnow.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/my.albertsnow.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}